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чавыча : Жизнь под водой

чавыча

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чавыча

Сообщение naper » 03 апр 2005 10:38

naper
 
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Re: чавыча

Сообщение infrogress » 03 апр 2005 11:12

Чавыча, самый крупный представитель рода дальневосточных лососей.
чавыча больше всего входит в реки Камчатки, причем она идет на нерест раньше прочих лососей, с середины мая. «Превеликая радость» аборигенов Камчатки при поимке чавычи понятна: появление ее в реках говорило о наступлении весны, об окончании нередко голодной зимы. Нерест чавычи длится все лето. Могучая рыба не боится быстрого течения (1 —1,5 м/сек) и выбивает хвостом нерестовые ямы в крупной гальке и булыжниках. Самка откладывает до 14 тыс. и более крупных, как у кеты, икринок. Вышедшие из икры мальки довольно долго, остаются в реке; некоторые из них, особенно самцы, там созревают, достигая в длину 75—175 мм. В американских реках встречаются и настоящие жилые формы. В реке Колумбия чавыча представлена двумя формами — весенней и летней. Сроки нереста у этих форм наследственны. В море чавыча живет от 4 до 7 лет. Это довольно холодолюбивый вид и нагуливается предпочтительно в водах Берингова моря, прилегающих к гряде Командорских и Алеутских островов. Питается в море чавыча главным образом мелкой рыбой. Ее промысловое значение у нас ввиду редкости незначительно.
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